Agronomic Crops

Blister
Beetles
Insecticide
b-cyfluthrin (P)
Baythroid XL 1EC
carbaryl (C)
Sevin XLR 4L
Sevin 4F
gamma-cyhalothrin (P)
Declare 1.25EC
λ-cyhalothrin (P)
Karate Z 2.08CS
Z-cypermethrin (P)
Mustang Max 0.8EC
Amount of Formulation
per Acre
1.6 – 2.8 oz.
16 – 32 oz.
16 – 32 oz.
1.28 – 1.54 oz.
1.6 – 1.92 oz.
2.8 – 4 oz.
Pounds Active
Ingredient per Acre
0.0125 – 0.022
0.5 – 1.0
0.5 – 1.0
0.0125 – 0.015
0.025 – 0.03
0.0175 – 0.025
Acres 1 Gallon or
1 Pound Dry Will Treat
80 – 45.5
8 – 4
8 – 4
100 – 83
83 – 69
45.7 – 32
Comments
Extremely toxic to fish and aquatic invertebrates. Do not feed green forage
within 15 days of harvest. Preharvest interval: 45 days. Maximum AI
per acre per season: 0.0875 lb. REI: 12 hours.
Toxic to bees and aquatic invertebrates. Preharvest intervals: 21 days for
grain, 14 days for grazing. Maximum AI per acre per season: 6 lb.
Toxic to bees. Pre-harvest interval for grazing: 21 days.
Maximum AI per acre per season: 6 lb.
Do not graze or harvest treated soybean forage, straw, or hay for livestock
feed. Do not apply within 45 days of harvest. Maximum AI per acre per
season: 0.03 lb.
Do not graze or harvest treated soybean forage, straw, or hay for livestock
feed. Do not apply within 45 days of harvest. Maximum AI per acre per
season: 0.06 lb.
Toxic to aquatic invertebrates. Postharvest interval is 21 days. Maximum
AI per acre per season: 0.125 lb.
BLIsteR BeetLes feed mainly on the leaves of soybean plants. Blister beetles may be grayish, black, or orange with stripes
and are about three-fourths inch long. They are rarely a problem in soybeans, but large numbers can cause extensive defoliation.
Some species will congregate in very large numbers within the soybean field, but damage is usually isolated to small patch-like
areas. The larvae of the blister beetle can be considered a beneficial insect. First instar larvae are very mobile and search out and
feed on grasshopper eggs.
tHResHoLD: If plants are not blooming or filling pods and beetles are present, apply insecticide if defoliation reaches
35 percent. If plants are blooming and filling pods and beetles are present, apply insecticide if defoliation reaches 20
percent.
table 1. Suggested plant populations for soybeans planted in MS. table 2. Growth stages of soybeans (from Fehr & Caviness 1977).
Row Width
in Inches
Feet of Row
per Acre
Plants per Foot
of Row
Plants per
Acre
VE – Emergence
VC – Cotyledon
40
38
36
30
20
14
12
10
7
6
13,068
13,756
14,520
17,424
26,136
37,337
43,560
52,272
74,674
87,120
8.00
7.50
7.00
6.00
4.00
3.50
3.00
2.75
2.25
2.00
104,544
103,455
101,640
104,544
104,544
130,680
130,680
143,748
168,016
174,240
V1 – First trifoliate
V2 – Second trifoliate
V3 – Third trifoliate
V4 – Fourth trifoliate
V (n) – Nth trifoliate (nth node)
R1 – Beginning bloom, one open flower at any node on the main stem.
R2 – Full bloom, open flower at one of the four uppermost nodes on the main stem with a fully developed
trifoliate leaf.
R3 – Beginning pod, three-sixteenths inch pod at one of the four uppermost nodes on the main stem with a
fully developed trifoliate leaf.
R4 – Full pod, three-fourths inch pod at one of the four uppermost nodes on the main stem with a fully developed
trifoliate leaf.
R5 – Beginning seed, one-eighth inch long seed in the pod at one of the four uppermost nodes on the main
stem with a fully developed trifoliate leaf.
R6 – Full seed, pod contains a green seed that fills the pod cavity at one of the four uppermost nodes on the
main stem with a fully developed leaf.
R7 – Beginning maturity, one normal pod on the main stem that has reached mature pod color, normally
brown or tan depending on variety.
R8 – Full maturity, 95 percent of the pods have reached their mature pod color. Five to ten days of drying
weather are generally required after R8 before the soybeans have less than 15 percent moisture. This can
occur more rapidly in early-planted soybeans in the Midsouth under very hot conditions.
34 Soybeans